Socket for electric-light globes



Jan. 29', 1929. 1,700,538

w. E. GRANT ETAL SOCKET FOR ELECTRIC LIGHT GLOBES Filed March 12, 1925 Patented Jan. 29, 1929.

WILLIAM EDWARD GRANT AN D MONTAGUE BUTLER BEAN, 0F SYDNEY, NEW SOUTH WALES, AUSTRALIA.

SOCKET FOR ELECTRIC-LIGHT GLOBES.

Application filed March 12, 1925, Serial No.

. of economical construction and very rapid the various parts, and

and easy wiring and which shall ensure absolute contact under all conditions of vibration and which shall allow of easy and cheap renewal of parts. Further features of the invention are an eflicient cord grip and a shade holder which permits easy removal and replacement of the shade. Still another feature of the invention is a simple lamp lock which, while not rendering it impossible for anyone acquainted with the construction of the device to extract the lamp, would prevent theft in most ordinary cases.

Accordingly therefore the invention consists of a shouldered divided plug of an in sulating material, fixed contacts in said plug, an enveloping sleeve, an outer casing, a shade retaining means and a lamp locking device, all of which parts together with their assembling will now be described with reference to the accompanying drawings in which Figure 1 is a perspective. view of the outer casing showing the shade retaining means and the lamp lock,

Figure 2 is a perspective view of the inner sleeve,

Figure 3 is a perspective view contact retaining plug,

F'gure 4 is a perspective view of the plug showing its two parts,

Figure 5 is a perspective view of t? shade of the inner retaining and lamp locking ring, Figure 6 is a sectional elevation of t 1e plug shown in Figure 3 on a section exposing a contact,

Figure 7 is a sectional elevation of thecomplete holder A showing the relation between Figure 8 is a sectional elevation on a, plane at right angles to that of Figure 7 of the com- 1 plete holder with one part of the inner plug removed.

The inner plug is formed in two approximately equal portions 9 and 10 which are substantially of the shape shown in Figure 4, the

' together.

15,027, and in Australia November 20, 1924.

part 9 having a central longitudinal groove '11 and a pair of grooves 12 while the other part 10 has a central longitudinal projecting key 13 which corresponds with and fits into the groove 11 when the portions are placed The part 10 has also a pair of parallel grooves 14 one on each side of the key 13 which correspond with grooves 12 in part 9.

The part 10 has a pair of contacts 15 keyed into it as shown in Figure 6 and situated at the end of grooves 14. These contacts have downwardly projecting points 16 which enter the corresponding depressions 17 in the portion-9. The grooves 14 have also waves 18 I which occur opposite corresponding depressions 19 in the grooves 11 of portion 9 which is secured to portion 10 by the screw 20 as shown in Figures 3 and 6. The lower ends of the plug formed by these two parts is shouldered as shown at 21 and a pair of diametrically opposed projections 22 formed thereon.

The complete plug fits into a sleeve 23 which is provided with an opposing pair of slots 24 corresponding to theprojections 22, an outwardly extending flange 25' at its lower end and an inwardly extending flange 26 at its upper end.

The sleeve 23 in turn fits into the outer casing 27 the inner surface of which is cylindrical While the outer surface is threaded. At the bottom of this casing are formed two grooves 28 which are diametrically opposed and which commence with a short vertical length and then run circumferentially, rising gradually as they progress, thus forming an inclined guideway. 1 T

In operation the ends of the incoming conducting wires 29 which have been led through the outer casing 27 of the sleeve 23 are bared and the wires are then placed one in each of the grooves 12 so that the bared ends 30 lie in the depressions 17 The other portion 10 of the plug is then placed in position so that the contact pieces 15 bear against the ends 30 as shown in Figure 6'and the parts 9 and 10 are clamped together by the screw 20 so that the wires 30 are in good electrical contact with the pieces 15, and are gripped along the length of the channel formed by the grooves 12 and 14, additional security being obtained by the action of the waves 18 and depressions 19. The key 13 as well as being-a centering means increases the insulation between thewires 29 and prevent stray ends of flexible wire coming into contact.

. in Figures 7 and 8. The plu The complete plug is then inserted in the sleeve 23 so that the projections 22 enter the slots 24, a coil spring 31 being first placed round the plug so that it bears against the shoulder 21 and the upper flange 26 as shown and sleeve together are then slipped into t e outer casing -27 so that the flange 25 bears against the lower edge of the casing 27 and the plug projects through the neck 32 at is then ready to receive the lamp of which the "and the lamp together with the 34 are shown in Figures 7 ride up the inside of the grooves 28 until the 7 contacts on the base of the lamp are forced hard against the contacts 15. And these opposing contacts are kept in exact registration by reason of the fact that the pins 34 and projections 22 both pass through the slots 24 so that as the lam; is turned the plug turns at the same rate, t e contacts 15 being arranged r in the correct position in the first place.

For the shade holder there are two' rings 35 and 36, the upper of which is threaded and screws upon the eiiternal .threads on the easing 27, the lower 36 has a plain interior in which two opposing gaps 37 are formed so arranged that the ring may be passed over the projecting grooves 28 and when partially r0- tated the parts 38 rest upon these grooves thus forming a support for the shade. The upper ring is screwed down to clamp it in position.

The lamp lock device, the fitting of which is optional, consists of a slot 39 formed in one or both of the grooves near its entrance and a pin or pins 40 projecting downwards from the ring 36 and so arranged that it will enter the slot or slots 39 and form a stop past whic the pin 34 of the lamp will not pass. To remove the lamp when the shade is secured in position it is necessary to screw the ring 35 up, lift the shade and lift the ring 36, thus withdrawing'the pin 40 to allow the lamp pin 34 This operation would do a clear passage.

of lamps but would not much to prevent theft make it impossible.

In Figure 7 .theposition of the shape 41 relative to the other parts is indicated by dotted lines. It is illustrated with the ring 36 lifted clear of the grooves 28 so that the lamp 33 the pins of which have just entered the vertical arts of grooves 28, may be turned into its final position. Figure 8 also illustrates this stage in the fittingof the lamp.

- bling the top. The holder' In order to make the wiring and the assemof the device easier, holes 42 may be drilled through the proj ecting points 16. The

bared ends 19 of the wire may ed through andtheextreme endsbentupwards round the points of 16. When it is desired .to use the holder in a situation where it is necessary to attach it directly to some rigid support, a thread either internal or external may be formed on the neck 32 by means of which the casing 27 is attached to a flange or plate on the bottom or support or alternatively the casing may be provided with a flange and be then be threadconnected direct to the ceiling or wall or batten. In either case the plug is shortend so as not to project beyond 32, it not being necessar. to have a cord grip suflicient to take the welght of the whole arrangement.

The outer casing and inner sleeve are preferably formedin. stamped metal, while the,

lug is constructed-of suitable moulded insuating material with metal contact pieces.

We claim.:

1. In an electric lamp holder of the type in which an outer casing has outwardly extending impressed grooves to receive the lamp pins a shade retaining means comprising a thread on the exterior of said casing, a threaded ring and a removable ringhaving a pair of opposing recesses in its inner edges.

2. In an electric lamp holder of the type in which an outer casing has outwardly extending impressed grooves having stop-pin receiving slots to retain ing device comprising a thread on the exterior of said casing, a threaded ring, a removable ring, and a downwardly projecting pin or pins on said removable ring.

3. In a lamp socket a diametrically divided plug having wire receiving grooves therein provided with depressions, contact members anchored in one part of the plug, and pro ections on the contact members adapted to enter h said depressions to clamp and electrically contact with the terminals of wires located in said grooves.

4. A lampsocket as claimed in claim 3 characterized by the provision sponding key Way in the other plug part.

5. A lamp socket as claimed in clalm 3 char-' acterized in that the parts of the plug are provided with corresponding depressions and projections in'the walls of the grooves for crimping the wires to prevent withdrawal thereof.

In-testimony whereof we have aflixed our signatures.

WILLIAM EDWARD GRANT. MONTAGUE BUTLER of a longitudinal key on one ofthe plug parts and a corre- 

